SILICA. 
303 
Fig. 233. 
Fig. 234. 
Fig. 236. 
X 
M 
s 
/ 
M 
X 
- 
Fig. 233, the same with the ter¬ 
minal planes differing from the 
preceding: l on Z 110° 2 ' (She¬ 
pard) ;* ditetraedre of Haiiy. 
Fig. 234, hisunitaire of Ftaiiy. 
Fig. 235, prisms low, the face 
x very narrow. 
Fig. 236, same as the preced¬ 
ing, with the face x much extend¬ 
ed. 
Fig. 237, the same as the pre¬ 
ceding, the face x much extended, 
and with the additional plane i: 
i upon x 129° 8'. 
Also the form represented in 
Fig. 238. 
Near the village of Amity, there are several localities of massive and crystallized horn¬ 
blende of various colours, and exhibiting a variety of crystalline forms. 
The following, in addition to those already introduced, have been found in the town of 
Warwick, viz: 
Fig. 239, the primary, with the 
obtuse lateral edges replaced by 
tangent planes. 
Fig. 240, the same, with the 
acute lateral edges replaced by 
tangent planes. 
Fig. 241, the same with the ob¬ 
tuse and acute lateral edges re¬ 
placed by planes. 
* The measurement of l on l, here given, is from Shepard. Haiiy has the angle l on l 149° 38’ which is the same as r on r. 
Crystals with the lesser angle are quite rare in this county. 
